Sunday gave us our Final Four for this year's Men's NCAA Tournament, a heart breaking loss for Kentucky, a return for North Carolina and a big win for CBS. March Madness competition went 35-minutes into the House of Moonves' primetime last night and, with that stellar 5.3/20 result among adults 18-49 from the 75-73 win by the Tar Heels over the Wild Cats in the 7-7:30 slot, the net scored a 2.1/7 overall demo result with a total of 15.91 million viewers. That UNC last…